forecast to continue all the way to kansas later this week. in colorado today, firefighters intensified their fight against a wildfire burning outside boulder, as 3,000 people were forced to evacuate. the blaze started early monday in four mile canyon. since then heavy smoke has blanketed the area, and flames have scorched nearly six square miles, destroying dozens of homes. the cause of the fire remains unknown, but officials said there's no indication it was intentionally set. the number of americans who smoke held steady in the latest government report. one in five adults-- or 46 million americans-- smoke regularly, according to the centers for disease control and prevention. since 2004, the smoking rate has basically been flat. and a separate report found nearly all children who live with a smoker have measurable tobacco toxins in their bodies. chicago's longtime mayor, richard daley, won't be running for reelection in 2011. the democrat announced his decision today at city hall, citing personal reasons. he said it felt like the time was right to step aside.